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| author | Qixue Xiao <s2exqx@gmail.com> | 2013-12-20 17:51:12 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-20 12:21:57 -0800 |
| commit | 351d6204bfc814a1aee300296d2f54460ffff172 (patch) | |
| tree | 8ee90f783108f35518c50fb9a43f2191e88e5a00 | |
| parent | 4903713cac8bd41b576e4e3eff3d54bd199a7737 (diff) | |
| download | linux-stable-351d6204bfc814a1aee300296d2f54460ffff172.tar.gz linux-stable-351d6204bfc814a1aee300296d2f54460ffff172.tar.bz2 linux-stable-351d6204bfc814a1aee300296d2f54460ffff172.zip | |
tty: an overflow of multiplication in drivers/tty/cyclades.c
there is an overflow in the code :
cyz_polling_cycle = (arg * HZ) / 1000,
the multiplicator arg comes from user, so it may be an overflow if
arg is a big number. And the value of cyc_polling_cycle will be
wrong when it is used next time.
Reported-by: Qixue Xiao <xiaoqixue_1@163.com>
Suggested-by: Yongjian Xu <xuyongjiande@gmail.com>
Suggested-by: Yu Chen <chyyuu@gmail.com>
Signed-off-by: Qixue Xiao <xiaoqixue_1@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/cyclades.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c index 33f83fee9fae..a57bb5ab761c 100644 --- a/drivers/tty/cyclades.c +++ b/drivers/tty/cyclades.c @@ -2709,6 +2709,8 @@ cy_ioctl(struct tty_struct *tty, break; #ifndef CONFIG_CYZ_INTR case CYZSETPOLLCYCLE: + if (arg > LONG_MAX / HZ) + return -ENODEV; cyz_polling_cycle = (arg * HZ) / 1000; break; case CYZGETPOLLCYCLE: |